Vulnerability-Lookup

FKIE_CVE-2021-31353

Vulnerability from fkie_nvd - Published: 2021-10-19 19:15 - Updated: 2026-06-17 03:51

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition. This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO.

References

	URL	Tags
	sirt@juniper.net	https://kb.juniper.net/JSA11218	Exploit, Mitigation, Vendor Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://kb.juniper.net/JSA11218	Exploit, Mitigation, Vendor Advisory

Impacted products

Vendor	Product	Version
juniper	junos	19.3
juniper	junos	19.4
juniper	junos	20.2
juniper	junos	20.2
juniper	junos	20.2
juniper	junos	20.3
juniper	junos	20.3
juniper	junos	20.4
juniper	junos	20.4
juniper	junos	21.1
juniper	junos	21.1
juniper	junos_os_evolved	*
juniper	junos_os_evolved	20.4
juniper	junos_os_evolved	20.4
juniper	junos_os_evolved	20.4
juniper	junos_os_evolved	20.4
juniper	junos_os_evolved	20.4
juniper	junos_os_evolved	20.4
juniper	junos_os_evolved	21.1
juniper	junos_os_evolved	21.1
juniper	junos_os_evolved	21.2
juniper	junos_os_evolved	21.2

JSON

To clipboard

{
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition. This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de administraci\u00f3n inapropiada de condiciones excepcionales en Juniper Networks Junos OS y Junos OS Evolved permite a un atacante inyectar una actualizaci\u00f3n BGP espec\u00edfica, causando el bloqueo y el reinicio del demonio del protocolo de enrutamiento (RPD), conllevando a una Denegaci\u00f3n de Servicio (DoS). Si se sigue recibiendo y procesando la actualizaci\u00f3n BGP, ser\u00e1 creada una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS) sostenida. Este problema afecta a versiones muy espec\u00edficas de Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versiones 20.2R2-S3 y posteriores, anteriores a 20.2R3-S2; 20.3 versiones 20.3R2 y posteriores, anteriores a 20.3R3; 20.4 versiones 20.4R2 y posteriores, anteriores a 20.4R3; versiones 21.1 anteriores a 21.1R2. Juniper Networks Junos OS 20.1 no est\u00e1 afectado por este problema. Este problema tambi\u00e9n afecta a Juniper Networks Junos OS Evolved: Todas las versiones anteriores a 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versiones anteriores a 21.1R2-EVO; 21.2-EVO versiones anteriores a 21.2R2-EVO"
    }
  ],
  "id": "CVE-2021-31353",
  "lastModified": "2026-06-17T03:51:36.277",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
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          "integrityImpact": "NONE",
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          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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        "source": "sirt@juniper.net",
        "type": "Secondary"
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  "published": "2021-10-19T19:15:08.720",
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
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}

CVE-2021-31353 (GCVE-0-2021-31353)

Vulnerability from cvelistv5 – Published: 2021-10-19 18:16 – Updated: 2024-09-16 17:37

Title

Junos OS and Junos OS Evolved: RPD core upon receipt of specific BGP update

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-755 - Improper Handling of Exceptional Conditions

Assigner

juniper mitre root

References

1 reference

URL	Tags
https://kb.juniper.net/JSA11218	x_refsource_CONFIRM

Impacted products

2 products

Vendor	Product	Version
Juniper Networks	Junos OS	Unaffected: unspecified , < 19.3R3-S2 (custom) Affected: 19.3R3-S2 Affected: 19.4R3-S3 Unaffected: 20.1R1 , < 20.1* (custom) Unaffected: 20.2 , < 20.2R2-S3 (custom) Unaffected: 20.3 , < 20.3R2 (custom) Unaffected: 20.4 , < 20.4R2 (custom) Affected: 21.1 , < 21.1R2 (custom)
Juniper Networks	Junos OS Evolved	Affected: unspecified , < 20.4R2-S3-EVO, 20.4R3-EVO (custom) Affected: 21.1-EVO , < 21.1R2-EVO (custom) Affected: 21.2-EVO , < 21.2R2-EVO (custom)

Date Public

2021-10-13 00:00

Show details on NVD website

JSON

To clipboard

{
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    "adp": [
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        "providerMetadata": {
          "dateUpdated": "2024-08-03T22:55:53.456Z",
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      "configurations": [
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        {
          "lang": "en",
          "value": "The following software releases have been updated to resolve this specific issue: \n\nJunos OS 18.4R2-S9, 19.1R3-S7, 19.3R3-S3, 19.4R1-S4, 19.4R3-S4, 20.1R3, 20.2R3-S2, 20.3R3, 20.4R3, 21.1R2, 21.2R1, 21.2R2, 21.3R1, and all subsequent releases.\n\nJunos OS Evolved 20.4R2-S3-EVO, 20.4R3-EVO, 21.1R2-EVO, 21.2R2-EVO, 21.3R1-EVO, and all subsequent releases.\n\nNote: Only those releases listed in the PROBLEM section above are affected.  This fix has also been proactively committed into other releases that are not vulnerable to this issue."
        }
      ],
      "source": {
        "advisory": "JSA11218",
        "defect": [
          "1595165"
        ],
        "discovery": "USER"
      },
      "title": "Junos OS and Junos OS Evolved: RPD core upon receipt of specific BGP update",
      "workarounds": [
        {
          "lang": "en",
          "value": "This issue can be mitigated in two ways:\n\n1) ensure that TTL propagation is either enabled or disabled in both places below:\n  protocols mpls no-propagate-ttl\n  routing-instance \u003cvrf\u003e no-vrf-propagate-ttl\n\n2) Disable multipath:\n  routing-instance \u003cvrf\u003e routing-options multipath"
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "sirt@juniper.net",
          "DATE_PUBLIC": "2021-10-13T16:00:00.000Z",
          "ID": "CVE-2021-31353",
          "STATE": "PUBLIC",
          "TITLE": "Junos OS and Junos OS Evolved: RPD core upon receipt of specific BGP update"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Junos OS",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "!\u003c",
                            "version_value": "19.3R3-S2"
                          },
                          {
                            "version_affected": "=",
                            "version_value": "19.3R3-S2"
                          },
                          {
                            "version_affected": "=",
                            "version_value": "19.4R3-S3"
                          },
                          {
                            "version_affected": "!\u003e=",
                            "version_name": "20.1",
                            "version_value": "20.1R1"
                          },
                          {
                            "version_affected": "!\u003c",
                            "version_name": "20.2",
                            "version_value": "20.2R2-S3"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "20.2",
                            "version_value": "20.2R3-S2"
                          },
                          {
                            "version_affected": "!\u003c",
                            "version_name": "20.3",
                            "version_value": "20.3R2"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "20.3",
                            "version_value": "20.3R3"
                          },
                          {
                            "version_affected": "!\u003c",
                            "version_name": "20.4",
                            "version_value": "20.4R2"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "20.4",
                            "version_value": "20.4R3"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "21.1",
                            "version_value": "21.1R2"
                          }
                        ]
                      }
                    },
                    {
                      "product_name": "Junos OS Evolved",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "\u003c",
                            "version_value": "20.4R2-S3-EVO, 20.4R3-EVO"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_name": "21.1-EVO",
                            "version_value": "21.1R2-EVO"
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                            "version_name": "21.2-EVO",
                            "version_value": "21.2R2-EVO"
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                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Juniper Networks"
              }
            ]
          }
        },
        "configuration": [
          {
            "lang": "en",
            "value": "This issue can occur when multipath is enabled:\n\n  routing-instance \u003cvrf\u003e routing-options multipath\n\nand one of the following two TTL propagation options (but not both) are enabled:\n\n  protocols mpls no-propagate-ttl\n  routing-instance \u003cvrf\u003e no-vrf-propagate-ttl"
          }
        ],
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
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            {
              "lang": "eng",
              "value": "An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition. This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO."
            }
          ]
        },
        "exploit": [
          {
            "lang": "en",
            "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
          }
        ],
        "generator": {
          "engine": "Vulnogram 0.0.9"
        },
        "impact": {
          "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-755 Improper Handling of Exceptional Conditions"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://kb.juniper.net/JSA11218",
              "refsource": "CONFIRM",
              "url": "https://kb.juniper.net/JSA11218"
            }
          ]
        },
        "solution": [
          {
            "lang": "en",
            "value": "The following software releases have been updated to resolve this specific issue: \n\nJunos OS 18.4R2-S9, 19.1R3-S7, 19.3R3-S3, 19.4R1-S4, 19.4R3-S4, 20.1R3, 20.2R3-S2, 20.3R3, 20.4R3, 21.1R2, 21.2R1, 21.2R2, 21.3R1, and all subsequent releases.\n\nJunos OS Evolved 20.4R2-S3-EVO, 20.4R3-EVO, 21.1R2-EVO, 21.2R2-EVO, 21.3R1-EVO, and all subsequent releases.\n\nNote: Only those releases listed in the PROBLEM section above are affected.  This fix has also been proactively committed into other releases that are not vulnerable to this issue."
          }
        ],
        "source": {
          "advisory": "JSA11218",
          "defect": [
            "1595165"
          ],
          "discovery": "USER"
        },
        "work_around": [
          {
            "lang": "en",
            "value": "This issue can be mitigated in two ways:\n\n1) ensure that TTL propagation is either enabled or disabled in both places below:\n  protocols mpls no-propagate-ttl\n  routing-instance \u003cvrf\u003e no-vrf-propagate-ttl\n\n2) Disable multipath:\n  routing-instance \u003cvrf\u003e routing-options multipath"
          }
        ]
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
    "assignerShortName": "juniper",
    "cveId": "CVE-2021-31353",
    "datePublished": "2021-10-19T18:16:34.884Z",
    "dateReserved": "2021-04-15T00:00:00.000Z",
    "dateUpdated": "2024-09-16T17:37:46.150Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.